The initiative was aimed at snaring drug traffickers who use public transport to move illegal substances around the country.

Officers from Police Scotland were joined by colleagues from British Transport Police, Military Police and staff from Cortonvale Prison.

Dogs trained to sniff out drugs were used in the crackdown, known as Operation Algiers.

And it was following the intervention of one of the dogs that a Perth man – travelling from Glasgow to Perth – was stopped and searched and found to be in possession of half an ounce of suspected heroin.

Stirling’s area police commander, Chief Inspector Russell Penman said that the operation (Operation Algiers) was instigated by Police Scotland’s community team covering the Castle Ward of Stirling.

He added: “It is recognised that drugs supply can be facilitated using public transport and my officers (working with colleagues from other services) carried out a proactive operation at Stirling Railway Station.

“We focused on those who use the rail network to travel.” Quite early into the operation the drugs dog indicated that a passenger may have been in possession of drugs and a search of that person revealed almost £2000 worth of heroin.

“As a result a 37 year-old male was arrested for being concerned in the supply of drugs.”

He added: “I would like to thank all of the staff involved as this kind of activity re-assures the public that we continue to focus on those who are involved in the sale and supply of drugs.

“The consequence of drugs supply is well known and blights our communities and I wanted to highlight our efforts to tackle this type of criminality.”